Ion and radical chemistry in (H₂O₂)_N clusters

Abstract

<p>We investigate the ionization induced chemistry of hydrogen peroxide in (H₂O₂)_N clusters generated after the pickup of individual H₂O₂ molecules on large free Ar_M, <italic>M̄</italic> ≈ 160, nanoparticles in molecular beams.</p>

Uptake of Hydrogen Bonding Molecules by Benzene Nanoparticles

“…This requires the molecules to be highly mobile on Bz N and coagulate to clusters within the 3 ms flight time from the pickup chamber to the ionization region. This is interesting to compare with the pickup of different molecules on other clusters, e.g., Ar N and (H 2 O) N . − We observed coagulation of different adsorbed molecules on Ar N , while the same molecules adsorbed on ice (H 2 O) N nanoparticles were less mobile and did not coagulate. Most recently, these observations have also been supported by a combined experimental and theoretical investigation of H 2 O 2 molecules on Ar N and (H 2 O) N .…”

Pickup and reactions of molecules on clusters relevant for atmospheric and interstellar processes

“…45,46,151,153 We have investigated the electron attachment to hydrogen peroxide (H 2 O 2 ) adsorbed on Ar N and ice (H 2 O) N nanoparticles. 66 The hydrogen peroxide coagulates to (H 2 O 2 ) M clusters on Ar N , as illustrated by the mass spectra in Fig.…”

“…2, only one pickup cell is drawn, which has recently been developed for the pickup of hydrogen peroxide. 66 A pseudorandom chopper is located in this vacuum chamber as well, which allows for accurate velocity measurements of the clusters, exploited in the cross section measurements discussed below. [67][68][69] The following chamber is devoted to the photodissociation experiments using velocity map imaging (VMI).…”

“…Yet another interesting example of the difference between the coagulation of molecules picked up on Ar N and (H 2 O) N can be found in our recent study of the hydrogen peroxide (H 2 O 2 ) pickup and reactions on these clusters. 66 The top panel of Fig. 6a shows the electron ionization mass spectrum of the clusters generated after the pickup on Ar N , % N E 160.…”

“…The spectrum exhibits several fragment ion series containing H 2 O 2 clusters. We label the major series corresponding to the protonated hydrogen peroxide (H 2 O 2 ) k H + (further series and their discussion can be found in our recent publication 66 ). Fragments with up to k = 20 H 2 O 2 molecules could be identified in the spectrum upon detailed analysis.…”